Dear Dirk,
Fluka uses, both for photon cross sections and edge energies, the
tabulations in epdl97:
https://www-nds.iaea.org/epdl97/
Indeed, there are differences between epdl97 and nist for Tungsten.
Thank you for spotting. At the moment, an update is not foreseen, it
should involve both cross sections an edges for all elements.
As for direct electron impact ionization, the plan is there, however the
future is not so near, sorry.
Regards
Paola
> I have a simple 120 keV electron beam incident on a 50 um thick tungsten
> target of which I am measuring the energy spectrum of the forward
> scattering photons with an energy resolution of 0.1 keV. I expect to see a
> typical partial-transmission target spectrum with characteristic x-rays
> for Ka2 of 57.982 keV (NIST) in the 57.9-58.0 keV bin and Ka1 of 59.319
> keV (NIST) in the 59.3-59.4 keV bin. However, I have peaks in the
> 58.1-58.2 keV bin and the 59.4-59.5 keV bin.
>
> Is this discrepancy to be expected?
>
> Secondly, upon researching the answer, I came across a few threads dating
> back to 2012 to as recent as 2019:
>
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/5107.html
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/8498.html
> http://pcfluka.mi.infn.it/web_archive/earchive/new-fluka-discuss/13977.html
>
> that indicate that FLUKA does not include characteristic x-rays from
> direct electron impact ionization events and thereby underestimates
> characteristic x-ray production. I saw nothing about this in the FLUKA2020
> release notes. Is there a plan to add this additional characteristic x-ray
> contribution in the near future
>
> _______________________________________________________________________________
> Dirk A. Bartkoski, Ph.D.
> Research Scientist | Division of Radiation Oncology
> [mdacc-logo2]
> T. Boone Pickens Tower (FCT8.5007)
> 1515 Holcombe Blvd.
> Unit 1420
> Houston, TX 77030
> (713)794-5026
>
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Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Sun Feb 09 2020 - 18:06:23 CET